I have a Century G3 clone. I am most impressed with it. It has the H&K internal parts as well as the barrel, lower receiver, trigger pack, front and rear sights and the buttstock/recoil spring mount.
The buttstock itself, the forend and the upper receiver plus several other small parts are made in the US to conform to the AWB.
It is reliable, VERY accurate, and didn't cost me $2500. These clones take all H&K accesories and parts seem to be interchangable.
The finish was great out of the box, though not quite like H&K's finish. The only problem I'm having is trying to determine if the upper is made of stainless or carbon steel. I can't tell. Century told me it was carbon steel, but I've heard conflicting information from folks on this board and others. Some say carbon and some say stainless.
Anyway, I think that the Century is the best bang for the dollar.
I have an ARMS claw mount on mine with a Bushnell 3-9x40 scope, a Harris bipod, Uncle Mike's Hand All grip sleeve and a cheek rest on the stock. I love it. I'm going to get a PSG-1 grip for it soon.